bpo-29751: add Cheryl Sabella to Misc/ACKS (GH-1268)

diff --git a/Misc/ACKS b/Misc/ACKS
index ab41431..be2561c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1330,6 +1330,7 @@
 Bernt Røskar Brenna
 Constantina S.
 Matthieu S
+Cheryl Sabella
 Patrick Sabin
 Sébastien Sablé
 Amit Saha